The Edinburgh Philosophical Journal, Volume 13

Front Cover
Archibald Constable, 1825 - Science
Contains the proceedings of the Royal Society of Edinburgh, the Wernerian Natural History Society (Edinburgh), etc.
 

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Page 104 - ... together in a glass of sea-water, with their orifices opposite to each other at the distance of two inches; they appeared to the naked eye like two living batteries, and soon covered each other with the materials they ejected.
Page 349 - These clutches are simultaneously acted upon by connecting levers and springs, and which, according as they are forced to the right or left, will enable the carriage to be moved forward or backward. To the fore naves are fixed two cylindrical metal rings, round which are two friction bands, to be tightened by a lever convenient for the foot of the conductor, and which will readily retard or stop the coach when descending hills. K is the seat of the conductor, with the steering wheel, L, in the front,...
Page 349 - ... of the road. To ascend steep parts of the road, and particularly when the carriage is used on railways, or to drag another behind it, greater friction will be required on the road than the two hind wheels will give, and there is therefore a contrivance to turn all the four wheels. This is done by...
Page 102 - ... watch the same orifice, at short intervals, for five hours, sometimes observing it for a quarter of an hour at a time, but still the stream rolled on with a constant and equal velocity. About the end of this time, however, I observed the current become perceptibly languid, the opaque flocculi...
Page 102 - On moving the watch-glass, so as to bring one of the apertures on the side of the Sponge fully into view, I beheld, for the first time, the splendid spectacle of this living fountain vomiting forth from a circular cavity an impetuous torrent of liquid matter, and hurling along, in rapid succession, opaque masses, which it strewed everywhere around. The beauty and novelty of such a scene in the animal kingdom long arrested my attention ; but after twenty-five minutes of constant observation, I was...
Page 160 - ... from the word of command being transmitted through several persons, entirely prevented. In point of fact, it places the engine as much under command as the rudder is — an undoubted improvement upon the clumsy method of bawling out to the engineer below, who either may not hear, or may chance to be out of the way — circumstances which may lead to the most serious accidents. " The different parts of the machinery are not exactly arranged in the sketch as they are executed in...
Page 348 - D are the two cylinders, one behind the other, which are fitted up with pistons and valves, or cocks, in the usual way, for the alternate action of steam above and below the pistons. The boiler being suspended on springs...
Page 163 - ... inspection, the position in which they are standing. 'When the engines stand for some time, it is necessary to let the steam pass freely through them for two or three seconds, on purpose to heat them, and expel any air that may have got inside. For this purpose, the long handle 14, standing by the side of
Page 53 - ... was the first who discovered that the black paint was carbonaceous ; and he is at the same time of opinion, that it was prepared from graphite, or anthracite...
Page 216 - He then proceeds to develope the science under the following heads: — 1. terminology ; 2. theory of the system ; 3. nomenclature ; 4. characteristic; 5. physiography. Under the first of these he explains those properties of minerals which manifest no change, either in the .properties themselves, or in the substances which possess them during their observation or examination, and which properties alone form the object of consideration in mineralogy, viewed as a pure science. They had before been...

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